The opening night of Summerfest will be a treat for all the Stevie Wonder fans out there, as Stevie will be playing the Marcus Amphitheater, the main stage for Summerfest. Stevie Wonder tickets go on sale through Ticketmaster a week from tomorrow. Concert ticket prices range from $30-90 or so. I would suspect that the general admission lawn seating will be a first come, first serve sort of thing. I wouldn't suspect they would sell lawn tickets for the show. Unlike at Alpine Valley, the lawn seats at Marcus aren't always sold as a separate ticket from the Summerfest grounds admission ticket.